SRT encoder transmission to obtain public network IP address

SRT is the most popular Internet transmission protocol nowadays. It has the advantages of low latency, stable and reliable transmission, and can be widely used in remote production, remote monitoring, remote interaction and other scenarios that require Internet remote transmission. SRT is a point-to-point transmission protocol. Because it needs to penetrate the Internet, at least one end needs to have a public network IP address. Set one end of the device with a public IP address to listener mode, and the other end uses caller mode to initiate a connection request to the opposite end. After the SRT connection is successfully established, the video stream can be transmitted in real time. KILOVIEW takes two sites A and B in a common networking environment as examples. From the encoder of site A, the video stream is transmitted to the decoder of site B in real time in SRT mode. The public network address of B is introduced, and the same is true for site A), here is mainly related to the network configuration, SRT specific configuration please refer to the SRT configuration manual. 3 solutions for SRT encoder transmission to obtain public network IP address 3 schemes for obtaining public IP address Solution 1: Broadband operator PPPoE mode to obtain public network IP address/port mapping Solution 2: Use FRP as the public network address Solution 3: Purchase an IP box to obtain a public IP address Solution 4: Other tools to obtain public IP address Solution 1: Broadband operators obtain public IP addresses in PPPoE mode Broadband operators can provide routers with public IP addresses (public IP addresses cannot be provided for 4G Internet access). The public IP addresses are configured on the outside interface of the router, and the router has a one-to-one mapping to the decoder IP/port. 3 solutions for SRT encoder transmission to obtain public network IP address 1) Set the WAN port of the router to obtain the public IP address in PPPoE mode 3 solutions for SRT encoder transmission to obtain public network IP address Note: If you want the router interface to directly obtain the public network IP address, you need the cooperation of the broadband operator. One is to set the broadband optical modem to transparent transmission mode, and place the PPPoE dial-up function on the router for execution, so that the public/private network address port mapping can be configured on the router. The second is that operators are required to conditionally provide public IP addresses to users (usually Telecom Broadband has more public IP address resources. Because the cost of applying for a fixed public IP address of an operator is too high, it is generally possible to have a public IP address. However, although the public IP address is changed, it can remain unchanged for a certain period of time, unless the device is restarted.) In general, if the WAN port gets the IP address of the 10.xxx, 172.16.xx–172.32.xx, 192.168.xx network segment, this belongs to the category of private network IP addresses, and users cannot directly access it through the Internet. . 2) Set the router's port mapping (Port Forward) As shown in the figure below, map the UDP33222 port of the external network address to the UDP33222 port of the internal network 192.168.4.101 (decoder IP address and ensure that this IP address is interoperable with the router). That is, when the peer device uses SRT to initiate a connection to port 33222 of the public IP address of the router, the router will directly forward the data stream to the decoder 192.168.4.101 device for response and reply. (SRT is transmitted in UDP protocol, so port mapping must be configured as UDP protocol) 3 solutions for SRT encoder transmission to obtain public network IP address Note: If the broadband operator can provide multiple public IP addresses (generally a dedicated line mode is required, only one public IP address can be obtained through PPPoE dial-up Internet access), one for the router to access the Internet, and one for the decoder alone, you can use The public network IP is directly configured on the network port of the decoder, so that the port mapping configuration can be avoided. Solution 2: Use FRP as the public network address Buy a server in the cloud (the cloud server can provide the public IP address), and use FRP to do the port mapping between the public network address and the private network address. When the peer device connects to the public network IP/port of the cloud server in SRT mode, FRP The service can forward the data stream to the intranet decoder device. FRP is a popular cross-platform open source and free intranet penetration tool. It supports Windows, macOS and Linux platforms to establish a connection between the external network and the internal network, and realize remote access to the internal network without a public IP address. 3 solutions for SRT encoder transmission to obtain public network IP address Solution 3: Purchase an IP box to obtain a public IP address After purchasing an IP box and its broadband service, the IP box can obtain a public IP address in the intranet, connect the decoder to it, and configure the device accordingly, then the public network address of the IP box and the private network IP of the decoder can be realized One-to-one correspondence of addresses. In this way, when the peer device is connected to the public network IP/port of the IP box in SRT mode, the IP box can forward the data stream to the intranet decoder device. 3 solutions for SRT encoder transmission to obtain public network IP address Solution 4: Other tools to obtain public IP address In addition, there are tools such as peanut shell, Ngrok, n2n, lanproxy, etc. can be used, please study by yourself if you love learning. Additional: Knowledge of IP address of popular science public network 01 Public IP address The public IP address can be accessed by anyone in the world (if you don't restrict this IP address) and used for Internet use. For example, 14.215.177.39 is the address of Baidu. You can access this IP address from any place where you can access the Internet. There is such a situation: The allocated IP for the allocated bandwidth of China Unicom can only be accessed within China Unicom, and cannot be accessed from the mobile network. This IP can only be regarded as "Unicom's public network IP", not a real public network IP address. 02 private network IP address Private network IP address, such as: 10.xxx, 172.16.xx–172.32.xx, 192.168.xx, etc. The private network address can only be used in the local area network, that is, it can only be accessed from the local network. Users across the Internet cannot pass this IP Address to a certain device. 03Fixed public IP address Fixed public network IP address, the opposite side of corresponding is dynamic public network IP address. Generally, when we use the dial-up mode to surf the Internet, the network service provider will temporarily "lend" an IP to you from the IP address pool. This IP will be "returned" when we go offline, and it may be "borrowed" to another when we connect again. An IP, that is, your IP is not fixed. Conversely, the service provider can assign you a private public network IP address, and the public network IP is fixed (the company’s private line is in this mode, but the operator’s charge for the private line mode is also more expensive. When we use SRT, generally It is fine to use a dynamic public IP address, which will remain unchanged for a certain period of time, or it can be accessed by means of a domain name).